RackHD / on-core / 1233

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Pull #328

travis-ci

fix RAC-6774

Issue:
Cannot assign to read only property '0' of string 'Task.Add.Hotspare'

Root Cause:
After upgrading node from v4 to v8, the property '0' of string turned
out read-only.

Done:
* Refine the code to avoid assigning to read only property of string.
* Add unit test

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